Arc-lamp electrode.



UNITED STATES PATENT QFFICE.

GEORGE A. THOMSON, 0F SOMERVILLE, NEW JERSEY.

ARC-LAMP ELECTRODE.

No Drawing.

Specification of Letters Iatent.

Patented June 14, 1910.

Application filed September 24, 1908. Serial No. 454,572.

. This invention relates to improvements in electrodes for electric arclamps,-the object of the invention being to provide an electrode whichwill be highly efiicient to insure an arc of large size and great luminosity and onein which the light produced shall be clear, white andsteady.

I have discovered that with the use in an electric arc lamp of ametallic electrode containing molybdic material, an arc of greatbrilliancy can be produced and that the light from such are will bewhite and of maximum'volume. The molybdic material may be in the form ofmetallic molybdenum, associated with a material having greaterelectrical conductivity than metallic molybdenum. The molybdenum oxidmay be in comminuted form and held together by suitable bindingmaterial, and other material, (such as metallic iron), will preferablybe added to increase the conductivity of the electrode. Excellentresults have been attained with the use of an electrode containing asmuch as eighty six per cent. metallic molybdenum. I have also found thatan arc of large volume and great brilliancy giving white light, can beproduced with the use of an electrode employing concentrates made frommolybdenum ore containing approximately fifteen per cent. oxid ofmolybdenum, said concentrates being inclosed within an iron tube. v

An arc of great volume and ,brilliancy with white light, can be producedwith the use of a fer'ro-molybdenum electrode containing approximatelyten percent. of metallic molybdenum and ninety per cent. netallic iron.I

Having fully described my invention what I claim as new and desire tosecure by Lettors-Patent, is

1. An electrode containing oxid of molyb denum.

2. An electrode'containin oxid of molybdenum and a material hav nggreater electrical conductivity.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

GEORGE A. THOMSON.

Witnesses:

FRANK S. SMITH, ROBERT G. Km,

